[perl #59550] readline returns EBADF at eof in 5.10.0

[Mark Martinec (via RT) <perlbug-followup@perl.org>]

# New Ticket Created by  Mark Martinec 
# Please include the string:  [perl #59550]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=59550 >


This is a bug report for perl from Mark.Martinec@ijs.si,
generated with the help of perlbug 1.36 running under perl 5.10.0.


-----------------------------------------------------------------
The readline() function (or a diamond I/O operator <>) returns
a EBADF (Bad file descriptor) as its errno status on end-of-file
when PERLIO is set to "stdio" (which unfortunately is a default
setting in some Linux distributions).

The situation worsened with 5.10.0 (compared to 5.8.8):

$ echo "test" | PERLIO="stdio" perl5.8.8 -e \
  'for($!=0; <>; $!=0){print}; $!==0 or die "Err: $!"'
test

$ echo "test" | PERLIO="stdio" perl5.10.0 -e \
  'for($!=0; <>; $!=0){print}; $!==0 or die "Err: $!"'
test
Err: Bad file descriptor at -e line 1, <> line 1.

This used to be an issue only on some Linux distributions
and not on FreeBSD. Now with 5.10.0 it happens here too.
The problem only occurs with PERLIO="stdio", not with an
unset PERLIO or with PERLIO="perlio".

The bug lures application programmers to ignore I/O status,
which is a bad programming practice and can lead to
hard-to-diagnose secondary application failures.
This is causing grief in at least two projects currently.
It would be really nice to get the status reporting right.


Btw, it is a probably related to bug #39060 (regarding non-NL
terminated last line), although missing last NL adds it own
quirk and perhaps still merits its own bug entry.
Now even with PERLIO="perlio" (or unset):

# line terminated with a NL
$ echo "test" | perl5.10.0 -e \
  'for($!=0; <>; $!=0){print}; $!==0 or die "Err:$!"'
test

# line not terminated with a NL
$ echo -n "test" | perl5.10.0 -e \
  'for($!=0; <>; $!=0){print}; $!==0 or die "Err:$!"'
Err:Bad file descriptor at -e line 1, <> line 1.
test


-----------------------------------------------------------------
---
Flags:
    category=core
    severity=medium
---
Site configuration information for perl 5.10.0:

Configured by mark at Fri Sep 26 14:12:03 UTC 2008.

Summary of my perl5 (revision 5 version 10 subversion 0) configuration:
  Platform:
    osname=freebsd, osvers=7.0-release-p1, archname=amd64-freebsd
    uname='freebsd neli-virtual.ijs.si 7.0-release-p1 freebsd 7.0-release-p1 #0: sun jun 1 03:02:30 cest 2008 
lesi@neli.ijs.si:usrobjusrsrcsysneli amd64 '
    config_args='-ds -e'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=undef, usemultiplicity=undef
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-DHAS_FPSETMASK -DHAS_FLOATINGPOINT_H -fno-strict-aliasing -pipe -I/usr/local/include',
    optimize='-O',
    cppflags='-DHAS_FPSETMASK -DHAS_FLOATINGPOINT_H -fno-strict-aliasing -pipe -I/usr/local/include'
    ccversion='', gccversion='4.2.1 20070719  [FreeBSD]', gccosandvers=''
    intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='cc', ldflags ='-Wl,-E  -L/usr/local/lib'
    libpth=/usr/lib /usr/local/lib
    libs=-lm -lcrypt -lutil -lc
    perllibs=-lm -lcrypt -lutil -lc
    libc=, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
    cccdlflags='-DPIC -fPIC', lddlflags='-shared  -L/usr/local/lib'

Locally applied patches:
    

---
@INC for perl 5.10.0:
    /usr/local/lib/perl5/5.10.0/amd64-freebsd
    /usr/local/lib/perl5/5.10.0
    /usr/local/lib/perl5/site_perl/5.10.0/amd64-freebsd
    /usr/local/lib/perl5/site_perl/5.10.0
    /usr/local/lib/perl5/site_perl/5.6.2.OFF
    /usr/local/lib/perl5/site_perl
    .

---
Environment for perl 5.10.0:
    HOME=/root
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/local/zenoss/bin:/usr/local/bin:/usr/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin
    PERL_BADLANG (unset)
    SHELL=/usr/local/bin/bash

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